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I have just setup a connection to the hose bib(Hose bib is the what your hose attaches to at the manual valve outside your home). I too only had a small GPM, around 9. But I was able to keep most of the pressure and increase my GPM to 15 by increasing the PVC Pipe that I ran off the hose bib. I used a 3/4 inch PVC sch40 Pipe and then increased it again to a 1 inch connector to the Sprinkler Valve (I used 1 inch valves) then ran all 1 inch main line PVC sch40 Piping and Poly Piping. Then I used 1 inch tees to a 3/4 threaded adapter and 3/4 inch Poly Pipe to the sprinkler and made all the adjustments so that the 3/4 piping would be stepped down to a 1/2 to connect to the sprinkler.

Anyway the end result was I was able to hook up 5 sprinklers using Rain Bird 1800's and VAN 18' Nozzles. At this point I got most of the use out of the nozzles. I could only use up to 220 degrees but that was enough to cut down on the number of valves from 6 to 4. I covered all the gardens and the turf. I cut the yard in fourth's. Used a mixture of degrees on the nozzles. I used from 20 degree's in some areas and 220 in other areas. Works great and I cut my costs too.

ARe you checking the GPM at a hose bibb? Sounds like you are. 6.6 is okay for the hosebibb. If you tap directly into the 3/4 copper you should get 11-14 GPM I would think at 60psi.....just a guess not scientific.

If you do the bucket test at a hosebibb, lots of times the hosebibb is very restrictive, usually it is 1/2 " copper.

Need more GPM

I have a 5/8"water meter with 3/4" copper service.As far as pressure, i have 60 PSI, but my GPM is only about 6.6 GPM using the five gallon bucket test.Anyway to get higher GPM? At this rate i'll have way too many zones. Need Help ??